Face it: Linux is insecure
Linux is insecure. Open source is insecure. Windows is insecure. All software is insecure.
Deal with it.
People keep having this delusion that security is a product. That, if you just buy some magic box, you'll have a program or an operating system that's as secure as Fort Knox.
It doesn't work that way. Security is a process, not a product.
Some systems are more secure than others. Linux, as anyone who pays any attention to security news knows, is a lot more secure than Windows. If we were talking cars, Linux would be a Volvo S80 and Windows would be a Ford "Hit here to blow up" Pinto.
But, any car can be hit, and any car can be hit hard enough to destroy it. It's all about the odds and driving safely.